Your best bet is Jakes Fabworks. They dont have a website but they are on facebook and instagram. I love mine and we have had much success. Last I heard he had chassis #6 still available but it may have been swooped up.
The harder you have to work for something the more rewarding it is when you finally get it. I bought a rather cheesy Crumco frame and built a 5 open car at my house. We ended up taking most of the Crumco out of it but I was really proud of that car and did well in it. Never give up on what you want!